[FedeB2160]

Third of three PRs for #24. It is built on #26 and retargets to main after #25 and #26.

Import preview

• The import confirmation shows the packages in the file in a grid (SEL., ID, SOURCE, VERSION), all ticked. Untick what you do not want. The confirmation is still Yes/No with No as the default, and a file that is not valid or is empty is still refused before it.
• Everything ticked: winget import runs on the file as it is, unchanged.
• Something unticked: the app writes a reduced copy to %TEMP%\wgt_import_<guid>.json, which Clear-WinGetTempFiles sweeps at the next start, and runs the same winget import --ignore-unavailable on it.
  • The kept package objects are written back verbatim. winget 1.29 saves --custom and --override in the export, so they survive without the app knowing their field names.
  • Sources left with no packages are dropped.
  • Root properties such as $schema are kept.
  • The file that was read is not changed.
• If a package carries properties beyond PackageIdentifier, Version, Channel and Scope, the confirmation says that winget will apply its saved installer arguments again.
• New-AppDialog / Show-AppDialog take an optional -Content, shown under the text.
• The grid columns have fixed widths: the dialog sizes itself to its content, and * columns collapse to zero there. I found this in a render.

Tests

• Get-ImportPackages:
  • rows in file order, with their source and pinned version;
  • everything starts ticked;
  • packages with stored arguments are counted;
  • a missing file returns $null.
• New-ImportSubset:
  • keeps exactly the chosen package, with its unknown Custom property and its Version;
  • drops the source left empty;
  • keeps $schema;
  • does not modify the file that was read.
• Start-Import passes the grid as -Content and goes through a reduced wgt_import_ file. The existing checks still hold: confirmation before import, default No, invalid file refused first.
• New-AppDialog -Content places the element under the text, which is kept.
• New-ImportPreviewGrid has a checkbox column.

Both suites pass offline. I checked the dialog in renders, light and dark.

🤖 Generated with Claude Code